/**
*      author: Y_Yao
*      created: 2025-04-19 20:39:33
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 9e18;
const int INF = 0x3f3f3f3f;
const int N = 1e6 + 6;
int n,m;
int cnt[N];
int id[N];

void solve()
{
    cin >> n >> m;
    int ans = 0;
    for(int i = 1;i <= m;i++)
    {
        int u,v;
        cin >> u >> v;
        int k = (u + v) % n;
        id[i] = k;
        cnt[k]++;
    }

    for(int i = 1;i <= m;i++)
    {
        ans += (m - cnt[id[i]]);
    }

    cout << ans / 2 << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    // cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}